@article{oai:nifs-repository.repo.nii.ac.jp:00000632,
 author = {Mutoh,  T. and Masuzaki,  S. and Kumazawa,  R. and Seki,  T. and Saito,  K. and Nakamura,  Y. and Kubo,  S. and Takeiri,  Y. and Shimozuma,  T. and Yoshimura,  Y. and Igami,  H. and Ohkubo,  K. and Watanabe,  T. and Ogawa,  H. and Miyazawa,  J. and Shoji,  M. and Ashikawa,  N. and Nishimura,  K. and Sakamoto,  M. and Osakabe,  M. and Tsumori,  K. and Ikeda,  K. and Chikaraishi,  H. and Funaba,  H. and Morita,  S. and Goto,  M. and Tokuzawa,  T. and Takeuchi,  N. and Shimpo,  F. and Nomura,  G. and Takahashi,  C. and Yokota,  M. and Zhao,  Y.P. and Kwak,  J.G. and Yamada,  H. and Kawahata,  K. and Ohyabu,  N. and Kaneko,  O. and Ida,  K. and Nagayama,  Y. and Noda,  N. and Komori,  A. and Sudo,  S. and Motojima,  O. and LHD, Experiment Group},
 issue = {Issue 5},
 journal = {Physics of Plasmas},
 month = {May},
 note = {Achieving steady-state plasma operation at high plasma temperatures is one of the important goals of worldwide magnetic fusion research. A high temperature of approximately 2  keV, and steady-state plasma-sustainment operation of the Large Helical Device (LHD) [O. Motojima, K. Akaishi, H. Chikaraishi et al., Nucl. Fusion 40, 599 (2000)] is reported. High-temperature plasmas were created and maintained for more than 30  min with a world record injected heating power of 1.3  GJ. The three-dimensional heat-deposition profile of the LHD helical divertor was modified and during long-pulse discharges it effectively dispersed the heat load using a magnetic-axis swing technique developed at the LHD. A sweep of only 3  cm of the major radius of the magnetic axis position (less than 1% of the major radius of the LHD) was enough to disperse the divertor heat load. The modification of the heat-load profile was explained well by field-line tracing. The steady-state plasma was heated and sustained mainly by hydrogen minority ion heating using ion cyclotron range of frequencies. The operation lasted until a sudden increase of radiation loss occurred, presumably because of wall metal flakes dropping into the plasma. The sustained line-averaged electron density was approximately 0.7?0.8×10^19  m^?3. The average input power was 680  kW, and the plasma duration was 31  min 45  s. This successful long operation shows that the heliotron configuration has a high potential as a steady-state fusion reactor.},
 title = {Thirty-minute plasma sustainment by real-time magnetic-axis swing for effective divertor-load-dispersion in the Large Helical Device},
 volume = {Vol.13},
 year = {2006}
}